chore(CI): add github actions workflow to replace travis

.github/workflows/push.yml

@@ -0,0 +1,41 @@
+name: Continuous Integration
+on: push
+jobs:
+  unit-tests:
+    runs-on: '${{ matrix.os }}'
+    strategy:
+      matrix:
+        os:
+          - ubuntu-20.04
+          - macos-10.15
+        node-version:
+          - 10.x
+          - 12.x
+    steps:
+      - uses: actions/checkout@v2
+      - name: 'Install node.js ${{ matrix.node-version }}'
+        uses: actions/setup-node@v2-beta
+        with:
+          node-version: '${{ matrix.node-version }}'
+      - name: Run unit tests
+        run: |
+          npm install
+          npm run travis
+  npm-publish:
+    needs: unit-tests
+    if: github.ref == 'refs/heads/master' && github.event_name == 'push'
+    runs-on: ubuntu-16.04
+    steps:
+      - uses: actions/checkout@v2
+      - name: Install node.js 12.x
+        uses: actions/setup-node@v2-beta
+        with:
+          node-version: 12.x
+      - name: Run semantic-release
+        env:
+          GH_TOKEN: ${{ secrets.GH_SEMANTIC_RELEASE_TOKEN }}
+          NPM_TOKEN: ${{ secrets.NPM_TOKEN }}
+        run: >
+          curl
+          "https://raw.githubusercontent.com/pelias/ci-tools/master/semantic-release.sh"
+          | bash -